Laser multi-layer classing of Mg-based alloys

By laser multi-layer cladding using a pulsed Nd-YAG irradiation the thickness of the cladding zone Mgbased alloys(ZM2 and ZM5)can reach about 1.0mm.The microstructure of the substrate and the classing zone was studied using optical microscope.scanning electron microscopy(SEM),X-ray diffractometry(XRD0and micro hardness analysis.It is observed that constituent of ZM5 alloy is δ Mg17Al12,that of ZM2 alloy is α MgZn Mg9Ce.That of cladding layer ZM2 alloy(L-ZM2)is Mg Mg2 Zn11 MgCe;while that of the cladding layer ZM5 alloy(LZM5)is Mg Mg32（Al,Zn)49,The hardness of the cladding area can be increased to values above HV127.Very fine uniform microstructure and the produced new phases of nanometer/sub-micrometer order were obtained.Now,many repaired Mg-based alloy components have been passed by flying test in outside field.     

浮子液位电动油气调节阀的研制设想

本文在浮子液位油气调节阀的基础上，提出了研制浮子液位电动油气调节阀的设想，供同行们探讨。     

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1 前言 随着我国机电工业的飞跃发展,人们对V带性能的要求也愈来愈高,同时作为V带的主材料之一的棉帆布价格暴涨,导致生产成本直线上升,而维纶纤维资源丰富,且具有优异的物理机械性能和化学稳定性,是替代棉帆布的理想选择,在橡胶管带行业中大力推广用作骨架材料前景广阔。     

用新型,简便,经济且对环境敏感的试采试井对多层油藏进行描述

本文提出一种新型、简便、经济且对环境敏感的方法来表征和模型单层初始压力不同的多层油藏，这一测试技术包括在地面监测流动前由层间窜流引起的压力数据。当试井中达到边界效应时，就可以估计单层渗秀率，表面积和供油面积。并且，由于地面上没有产了，新试井方法非常适用于浅海井或在环境敏感性区域进行试井。     

声光器件的换能器带宽—换能器增透膜系的选择

通过计算机编程运算ＴＬ－Ｆ曲线来讨论换能器的带宽，实现了声增透膜系的选择。